FAIR VALUE MEASUREMENTS (DETAILS 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Total Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	$ 10,937	$ 15,288
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	1,862	(3,208)
Included in OCI	0	0
Purchases	2,723	4,795
Sales	0	0
Settlements/ Distributions	(9,022)	(5,938)
Closing Balance	6,500	10,937
Change in unrealized investment gain/(loss) relating to liabilities held at the reporting date	(654)	8,337
Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	49,440	73,631
Transfers into Level 3	5,733	5,072
Transfers out of Level 3	(7,471)	(57,756)
Included in earnings	(1,037)	(49)
Included in OCI	187	(457)
Purchases	66,679	39,225
Sales	(4,371)	(1,723)
Settlements/ Distributions	(12,760)	(8,503)
Closing Balance	96,400	49,440
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	27,257	37,046
Transfers into Level 3	36,378	0
Transfers out of Level 3	0	0
Included in earnings	16,713	3,705
Included in OCI	0	0
Purchases	44,405	0
Sales	0	0
Settlements/ Distributions	(21,911)	(13,494)
Closing Balance	102,842	27,257
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	16,713	3,705
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	29,320	111
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	6,870	2,480
Included in OCI	0	0
Purchases	1,289	26,865
Sales	0	0
Settlements/ Distributions	(9,924)	(136)
Closing Balance	27,555	29,320
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	1,298	3,505
Total Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	106,017	110,788
Transfers into Level 3	42,111	5,072
Transfers out of Level 3	(7,471)	(57,756)
Included in earnings	22,546	6,136
Included in OCI	187	(457)
Purchases	112,373	66,090
Sales	(4,371)	(1,723)
Settlements/ Distributions	(44,595)	(22,133)
Closing Balance	226,797	106,017
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	18,011	7,210
Corporate Debt [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	38,518	15,837
Transfers into Level 3	5,733	0
Transfers out of Level 3	(4,955)	(7,903)
Included in earnings	(1,037)	(49)
Included in OCI	1,296	88
Purchases	48,298	39,225
Sales	(4,371)	(1,723)
Settlements/ Distributions	(7,607)	(6,957)
Closing Balance	75,875	38,518
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
CMBS [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	10,922	17,763
Transfers into Level 3	0	5,072
Transfers out of Level 3	(2,516)	(9,902)
Included in earnings	0	0
Included in OCI	(192)	(647)
Purchases	0	0
Sales	0	0
Settlements/ Distributions	(5,153)	(1,364)
Closing Balance	3,061	10,922
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
ABS [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	40,031
Transfers into Level 3	0	0
Transfers out of Level 3	0	(39,951)
Included in earnings	0	0
Included in OCI	(917)	102
Purchases	18,381	0
Sales	0	0
Settlements/ Distributions	0	(182)
Closing Balance	17,464	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	0	0
Other Privately Held Investments [Member] | Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	(2,263)	0
Included in OCI	0	0
Purchases	44,405	0
Sales	0	0
Settlements/ Distributions	0	0
Closing Balance	42,142	0
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	(2,263)	0
CLO-Equities [Member] | Other Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	27,257	37,046
Transfers into Level 3	36,378	0
Transfers out of Level 3	0	0
Included in earnings	18,976	3,705
Included in OCI	0	0
Purchases	0	0
Sales	0	0
Settlements/ Distributions	(21,911)	(13,494)
Closing Balance	60,700	27,257
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	18,976	3,705
Derivative [Member] | Other Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	10,937	15,288
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	1,862	(3,208)
Included in OCI	0	0
Purchases	2,723	4,795
Sales	0	0
Settlements/ Distributions	(9,022)	(5,938)
Closing Balance	6,500	10,937
Change in unrealized investment gain/(loss) relating to liabilities held at the reporting date	(654)	8,337
Derivative [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	4,395	111
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	6,772	2,555
Included in OCI	0	0
Purchases	1,289	1,865
Sales	0	0
Settlements/ Distributions	(9,924)	(136)
Closing Balance	2,532	4,395
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	1,200	3,580
Insurance-linked Securities [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	24,925	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in earnings	98	(75)
Included in OCI	0	0
Purchases	0	25,000
Sales	0	0
Settlements/ Distributions	0	0
Closing Balance	25,023	24,925
Change in unrealized investment gain/(loss) relating to assets held at the reporting date	$ 98	$ (75)